1. National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR
2. Hearing Center of Excellence, Department of Defense, San Antonio, TX
3. Department of Medical Informatics and Clinical Epidemiology, Oregon Health & Science University, Portland
4. Department of Otolaryngology-Head & Neck Surgery, Oregon Health & Science University, Portland
5. Oregon Hearing Research Center, Oregon Health & Science University, Portland